My chats are completely empty after years!

I’m logging with connected google account since very start or using GPT. Today I needed chatGPT after week or two and it has lil different design and all my chat history is gone WTF and it acts like I made new account. History is 50% of GPT, how this can happen? What an unreliable company, I’m literally angry as I cannot continue my work, it’s like somebody formatted my computer suddenly. FIX IT!